Check valve for respirating apparatus



March 22 1927 A.;B. DRAGER CHECK VALVE 'Fon RESPIRATING APPARATUS Filed April 2:2, 1926 v lNl/f/V for? //L am/vom BERN/MRO 0045s,?

Patented Mar. 22, 1927-,

' UNI ED? STATES laws PATENT ori-" ce;

hmxannnn mammalian nmlann, or Lennon, claimant cmicx VALVE roii nizsrrm'rmaarrmrus.

Application filed April-22, 1926, Serial No. 103,680, in Germany July 4, 1925.-

vThepresent invention refers Tmore ticularly to respirating apparatus an to la check-valve therefor in which the valve proper is formed by a flexible diaphra m adapted in the closed position ofthe va ve held in position.

to rest on an annular seat. Diaphragms bf this kind in existingconstructions, are attached throughout their entire peripheries .to' the casings and in some recent-ch'eckvalve arrangements have been supported onlymt certain portions of their peripheries on the seats or other parts of the valves;

In the present instance the diaphragm is provided 0nits periphery with a plurality of radial ears bywhich the diaphragm is Thecheck-valve is par: ticularl'y adapted to- .be used as an exhaling valve in respirators or filter-devices having a mask or mouth piece, and the object is toforma very tight closure-even under the.

slightest movement of the air, 'to prevent noxious gases from entering from the outer an efficient and perfect closure is not always secured because the diaphragm rests upon the seat, with too large a part of its surface,'and it hasalso happened that after .bein out of'use for several months the diap iragm adheresor clings to the seat and thereby renders the valve inoperative for its intended ing' means to ,hold'the dia hragm only at certainpoints of the perip cry, and moreover by forming a bead on the valve proper 1 or on the seat, soias to secure a close joint merely along a linei By choosing suitable materials in the construction oi the device the possibility .of the valve adhering'to the seat -will.be.--1educedto a minimum. The

reliability ofaoperation 'of the valve 'may further beincreased-by tensioning the diaphragm to such an extent-,- that even in the valve constructed according to 'the invention; Fig. 4is thesectionpfamodified con struction; F1 5 and 6 are a plan and a sec,- tion 10f anot er 1nodification; Fig. 7 is a of which are fastene urpose. h These draw acks are avoided by providadapted-to rest on the annular may, ar-

ranged on a carrier b, which in the con-. structions shown has a tubedike neck 0, by which the valve .may be attached to any kind ofrespirating phragm .is provide a number ofradial lugs or ears: f, the ends (I to any fixed part 05 the valve and preferably to the carrier of the valve seat g.

, To avoid a too large contacting surface 70,

between the diaphragm and the seat, ither the diaphragm or the seat is provid with a bead. Inthe construction shown the seat itself is." rounded ofl, or 1s given a mor or less sharp edge to form the bead g; T us when the diaphragm rests on ,the seatthe contact will .in'erely take place along a line,

thereby'in'suring a good closure.-'

Both, .the seatas well as the diaphragm,

may be made of flexible or elastic material, 89

such as rubber. To prevent the two' from adhering or clinging to one another when the valve has not been used for a long time, either .the bead or the seat g'ma be made of metal, or if made of rubber. it may, as

shown in .Fig. 4, be providedwith' a metal ring I; of curved cross, section; alter-na tivel it 'may be of advantage to make the diapfragm of leather instadof rubber, because leather make-the, seat and even its bead ofrubber,

it may be of" advantage to plate thefdia-' phr'agm at lea'st at such places where- 1t contacts with metal, for instance w th thin 5 a tin foil, orthe like.

If the seat '9 is of'met'al it may be made valves'o as .to adapt the diaphragm to rest "on the seat with a -sli htpi essure when the v ,lve-is not in operat on In the construetron shown in=--Fig's. 1 to 3 the diaphragm a, -1o5 with its radial ears fiis soconstructed, that I when T breathing takes place, that is to say, when the Valve isat rest, the, diaphragm apparatus. The diaon its periphery with '65.

generally will not adhere or 00 v stick :to metal. :If -it;is found convenient to "curves'do'wn, as is shown in Fig. 2. The T tension inherent in tl'i'e' diaphra'gin will then -110 g in Fig. .3.

' of the seat carrier 6. In thi case it is of cause the diaphragm to bear againstthe seat with a slight pressure. In exhaling, the diaphragm will bulge outwardly as shown 'In the construction shown in Figs. 5 and 6 the'tension given-to thfe diaphragm'a to cause the latter to rest on the seat" witha' sli ht. pressure is secured by means of an annu ar spring 2', which engages the ends of the ears and presses them against the upturned flange advantage to make the seat' arrier b and preferably also the neck 0 of an elastic material. .In the constrnctionshown in Figs.

1 to 3, the corresponding artsare indicated as being made of metal Q though said parts-Y may also be made of elastic material, such as rubber, if desired.

In the .modificatlon shown in Figs. 7 and 8' it isassumed' that the neck 0 together with the seatcarrier b, and the seat 9 itself are made of metaL- The radial ears f are turned inwardly so as'to produce prolongations 71:, the e'ndsof which are held within an annular groove m below the seat y, by a when or cord or the like; The lugs or prolongations k may be elastic in themselves to hold the .sioned will have'the tendency to stretch the.

diaphragm a stretched, so as to allow the diaphragm a to rest on the seat g with a. slight pressure. -However, if the lugs 70 and theears' f arejmadeof pliable material each pair otopp'osite ears'may be engaged by the ends of ans shaped spring 0 as is shown in Fig-8 Thus if there are four ears and ,lugs, two springs o crossing one another will'be' used; the "springs thus ,being tendiaphragm a1." 7 The seat carrier-b. which is 46 generallyexpand d to form a disk, may be I i stitute 'a dishfor enclosing the provided with a annular flange p to conv ofthe valve 'and'to enable the valve to be conveniently gripped when it isdismounted.

'1. A check-valve for fespirating appa-.

ratus comprising ara rrier including elastic portions and an annular seat, aflexible diaphragm adapted to reston said seat', a phidelicate parts ralit I diap ragm an attached to theelastic portions of-said carrier and a spring engaging said radial ears for maintaming said diaphragm in a stretched condition.

of ears rojecting radially from said 2; A check-valve for respirating appa-" iratus comprising a carrier including a valve- 05 v fphragm adapted to rest on said seat, a pluralitv of ears projectingradially from said diaphragm and being turned back towardthe ends said carrier, means vfor securin of said ears in said groove; an a spring engaging the radial ears for maintaming the diaphragm in a-stretched condition.

4. A. check-valve for' respi'rating appa .ratus comprising a carrier includingia valveseat, av flexible diaphragm adap to rest radially from said diaphragm, in'opposite directions in pairs. and S-shaped springs engaging the opposite ears of each pair for maintaining the diaphragm in a; stretched condition. v

5. 'A, check-valve fdr respirating apparatus comprising. a; carrier including an annular seat, a flexible dlaphragm'adapted to rest on said annular seat, a

flexible ears rejecting radially rom the periphery of t e diaphragm for maintaining the latter in operative relation to said seat, andan annular flange on said carrier independent of'said diaphragm and surrounding the periphery thereof to enclose the" valve elements andwonstituting a means for.en-'

ablingthe valve to be conveniently gripped. In'testimony. whereof I have signed my "name I to this specification.

ALEXANDER BERNHARD pales:

lurality of 'on said seat, a plurality ofears-projectin'g 

